init_mem_mapping
void init_mem_mapping(void);
void (*init_mem_mapping)(void);
init_mem_mapping();
.init_mem_mapping = x86_init_noop,
x86_init.hyper.init_mem_mapping();
h->init_mem_mapping = x86_init_noop;
.init.init_mem_mapping = xen_hvm_init_mem_mapping,